Rotary electrical machine

ABSTRACT

A rotor included in a rotary electrical machine has magnet, through holes, a rotor core, storage holes, introduction members, a side plate, etc. The introduction members communicate partly or entirely with openings of the one or more through holes and introduce a refrigerant. Each of the introduction members includes an intake portion, a protrusion portion, and a communication portion. The intake portion is provided at the one end of the protrusion portion and is opened toward the rotational direction of the rotor to take in the refrigerant. The protrusion portion protrudes axially from the end surface of the rotor. The communication portion is provided at the other end of the protrusion portion and communicates with the opening.

TECHNICAL FIELD

The present disclosure relates to a rotary electrical machine includingone or more magnets and one or more through holes.

BACKGROUND ART

For example, PTL 1 discloses a technique relating to a rotor in apermanent magnet-type rotary machine intended to enhance the heatdissipation of spacers to improve the cooling efficiency of permanentmagnets. This rotor includes a non-magnetic press plate on both endsurfaces of a boss to suppress the axial displacement of the permanentmagnets and the spacers. The rotor also has ventilation holes thatpenetrate through the press plates and the spacers in the axialdirection.

CITATION LIST Patent Literature

[PTL 1] JP 3480800 B

SUMMARY OF THE INVENTION [Technical Problem]

However, when the technique described in PTL 1 is applied to a rotaryelectrical machine, the press plates disturb the outside air at theentrances to the ventilation holes during rotation. Accordingly, anair-curtain effect is produced at the entrances to the ventilation holesto block the flow of air into the ventilation holes. The air-curtaineffect becomes more enhanced with increase in the rotation speed of therotor.

The ventilation holes are provided in the spacers. Each of the spacershas a region with a small inter-electrode width to suppress leakage fluxbetween magnets that are arranged circumferentially at the outerperipheral portion of the rotor. Each of the ventilation holes cannothave a large cross-sectional area. Accordingly, the flow rates of airinto the ventilation holes for cooling are suppressed.

Due to the air-curtain effect and the cross-sectional areas of theventilation holes described above, the air hardly passes through theventilation holes even when the rotor rotates. As a result, the coolingeffect cannot be obtained.

The present disclosure provides a rotary electrical machine implementingthe following matters. A first object of the present disclosure is tointroduce actively a refrigerant into a through hole without influenceof the air-curtain effect. A second object of the present disclosure isto ensure the large cross-sectional area of the through hole to enhancethe cooling effect.

Solution to Problem

A first rotary electrical machine as an aspect of the technique of thepresent disclosure has: a rotor (13) that includes one or more magnet(13 a) and one or more through holes (13 b) penetrating in an axialdirection; and a stator (11) that is opposed to the rotor. The firstrotary electrical machine has an introduction member (16) thatcommunicates partially or entirely with the one or more penetrationholes and introduces a refrigerant (18 a, 18 b). The introduction memberincludes a protrusion portion (16 b), an intake portion (16 a), and acommunication portion (16 c). The protrusion portion protrudes axiallyfrom an end surface of the rotor. The intake portion is provided at oneend of the protrusion portion and is opened toward the rotationaldirection of the rotor to take in the refrigerant. The communicationportion is provided at the other end of the protrusion portion andcommunicates with the opening. As described above, in the first rotaryelectrical machine, the introduction member protrudes axially from theend surface of the rotor and is opened toward the rotational directionof the rotor. Accordingly, in the first rotary electrical machine, it ispossible to introduce actively the refrigerant to cool the magnetwithout influence of the air-curtain effect.

In a second rotary electrical machine as an aspect of the technique ofthe present disclosure, the magnet is arranged closer to an outer radialside than to the through hole.

Accordingly, the refrigerant passing through the through hole issubjected to centrifugal action and moves in such a manner as to beattracted to the outer radial side on which the magnet is arranged.Accordingly, in the second rotary electrical machine, the magnet can becooled efficiently.

In a third rotary electrical machine as an aspect of the technique ofthe present disclosure, the through hole communicates with a storagehole storing the magnet and has a barrier function to prevent magneticleakage of the magnet. Accordingly, in the third rotary electricalmachine, the refrigerant can cool not only the wall surface of thethrough hole but also the side surface of the magnet.

In a fourth rotary electrical machine as an aspect of the technique ofthe present disclosure, the introduction member is scoop-shaped.Accordingly, in the fourth rotary electrical machine, the refrigerantsubjected to turning force can be passed into the through hole withoutwaste. As a result, in the fourth rotary electrical machine, the magnetcan be cooled effectively.

In a fifth rotary electrical machine as an aspect of the technique ofthe present disclosure, the intake portion is positioned closer to theouter radial side than to the communication portion. Accordingly, in thefifth rotary electrical machine, the amount of rotational movementbecomes larger with increasing proximity to the outer radial side totake in a larger amount of refrigerant (increase the amount ofrefrigerant). As a result, in the fifth rotary electrical machine, thecooling efficiency is improved.

In a sixth rotary electrical machine as an aspect of the technique ofthe present disclosure, the intake portion includes an outer radial-sidewall portion (16 ae) and an inner radial-side wall portion (16 ai) thatextend axially from the end surface of the rotor. The outer radial-sidewall portion has an inclination angle (first inclination angle) αrelative to the radial direction and the inner radial-side wall portionhas an inclination angle (second inclination angle) β relative to theradial direction. In this case, in the sixth rotary electrical machine,the inclination angles (the first and second inclination angles) α and βare in a relationship α>β. Accordingly, in the sixth rotary electricalmachine, the inclination angle α of the outer radial-side wall portionis larger than the inclination angle β of the inner radial-side wallportion to take in a larger amount of refrigerant (increase the amountof refrigerant). As a result, in the sixth rotary electrical machine,the cooling efficiency is improved.

In a seventh rotary electrical machine as an aspect of the technique ofthe present disclosure, the introduction member has an internal height(16 h) of the protrusion portion that is gradually smaller from theintake portion toward the communication portion. Accordingly, in theseventh rotary electrical machine, the refrigerant moving in theintroduction member is increased in pressure. As a result, in theseventh rotary electrical machine, even when the axis of the rotor islong, the refrigerant is guided reliably to the opposite side surface ofthe through hole.

In an eighth rotary electrical machine as an aspect of the technique ofthe present disclosure, the introduction member has a surface-directionwidth (16 w) of the protrusion portion that is gradually smaller fromthe intake portion toward the communication portion along the endsurface of the rotor. Accordingly, in the eighth rotary electricalmachine, the refrigerant moving in the introduction member is increasedin pressure. As a result, in the eighth rotary electrical machine, evenwhen the axis of the rotor is long, the refrigerant is guided reliablyto the opposite side surface of the through hole.

In a ninth rotary electrical machine as an aspect of the technique ofthe present disclosure, the introduction members are provided on bothend surfaces of the rotor. Further, in the ninth rotary electricalmachine, the introduction members 16 are provided such that, on both endsurfaces of the rotor, the through hole communicating with one endsurface and the through hole communicating with the other end surfaceare different. Accordingly, in the ninth rotary electrical machine, therefrigerant is taken in from both end surfaces of the rotor and isdischarged from the other end surface. As a result, in the ninth rotaryelectrical machine, cooling can be performed in a balanced manner.

In a tenth rotary electrical machine as an aspect of the technique ofthe present disclosure, the introduction member is provided such thatthe communication portion communicates with a plurality of openings. Inaddition, in the tenth rotary electrical machine, the refrigerant isbranched so that an equal amount of refrigerant flows into the pluralityof openings. Accordingly, in the tenth rotary electrical machine, anequal amount of refrigerant flows into the through holes. Therefore, inthe tenth rotary electrical machine, the magnets corresponding to thethrough holes can be equally cooled.

In an eleventh rotary electrical machine as an aspect of the techniqueof the present disclosure, a plurality of openings is provided on afront side and a rear side with respect to the rotational direction ofthe rotor. A space from the opening on the front side to the inner wallsurface of the protrusion portion (the volume of a first space) has avolume Vf, and a space from the opening on the rear side to the innerwall surface of the protrusion portion (the volume of a second space)has a volume Vr. In this case, in the eleventh rotary electricalmachine, the volumes (the volumes of the first and second spaces) Vf andVr are in a relationship Vf>Vr. Accordingly, in the eleventh rotaryelectrical machine, while the refrigerant taken in from the intakeportion moves toward the through hole, the refrigerant becomes larger inpressure and flow rate with increasing proximity to the rear side in therotational direction. As a result, in the eleventh rotary electricalmachine, an equal amount of refrigerant flows into the through holespositioned on the front side and rear side with respect to therotational direction of the rotor.

In a twelfth rotary electrical machine as an aspect of the technique ofthe present disclosure, the introduction member is molded integrallywith a side plate (17) provided on the end surface of the rotor.Accordingly, in the twelfth rotary electrical machine, there is no needto prepare a separate introduction member. Therefore, in the twelfthrotary electrical machine, it is possible to suppress the manufacturingcost of the rotor. In addition, in the twelfth rotary electricalmachine, the introduction member and the side plate are provided as onecomponent. Accordingly, in the twelfth rotary electrical machine, thereis no reduction in the work efficiency during manufacture of the rotor.

In a thirteenth rotary electrical machine as an aspect of the techniqueof the present disclosure, a material for the introduction member is anon-magnetic body or a material including a non-magnetic body.Accordingly, in the thirteenth rotary electrical machine, it is possibleto suppress performance degradation due to flux leakage.

The “rotor” includes no field winding but has a magnet and a throughhole. The “introduction member” has a protrusion portion, an intakeportion, and a communication portion. Other components may bearbitrarily provided. The “communication” means that two elements areconnected to each other to allow a refrigerant to flow therebetween. The“refrigerant” applies to air, oil, oil mist, or the like. The “sideplate” is also called an end plate that is used for assembly of therotor. The “outer radial side” means the outside with respect to theradial direction of the rotor, and the “inner radial side” means theinside with respect to the radial direction of the rotor. The“non-magnetic metal” refers to all metals unlikely to be attracted to amagnet, such as copper, aluminum, and stainless steel, for example. The“non-magnetic body” has no limitations on its material and composition,provided that magnetic flux is unlikely to flow therein. Thenon-magnetic body applies to non-metallic materials such as non-magneticmetals and resins. The “rotary electrical machine” may be any devicewith a shaft (rotation shaft). The rotary electrical machine applies topower generator, electric motor, motor generator, and others, forexample. The power generator may be a motor generator acting as a powergenerator.

The electric motor may be a motor generator acting as an electric motor.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic cross-sectional view of a first configurationexample of a rotary electrical machine;

FIG. 2 a cross-sectional view of a first configuration example of arotor illustrated in FIG. 1 taken along a line II-II of FIG. 1;

FIG. 3 is a side view of the first configuration example of the rotorillustrated in FIG. 1 as seen from a direction III of FIG. 1;

FIG. 4 a side view of the first configuration example of the rotorillustrated in FIG. 1 as seen from a direction IV of FIG. 1;

FIG. 5 is a schematic diagram illustrating a first configuration exampleof an introduction member;

FIG. 6 is a schematic diagram illustrating a second configurationexample of the introduction member;

FIG. 7 is a schematic diagram illustrating a third configuration exampleof the introduction member;

FIG. 8 is a schematic diagram illustrating a fourth configurationexample of the introduction member;

FIG. 9 is a schematic diagram illustrating a fifth configuration exampleof the introduction member;

FIG. 10 is a schematic diagram illustrating a sixth configurationexample of the introduction member;

FIG. 11 is a schematic diagram illustrating a seventh configurationexample of the introduction member;

FIG. 12 is a schematic diagram illustrating an eighth configurationexample of the introduction member;

FIG. 13 is a schematic diagram illustrating a ninth configurationexample of the introduction member;

FIG. 14 is a schematic diagram illustrating a tenth configurationexample of the introduction member;

FIG. 15 is a schematic diagram illustrating an eleventh configurationexample of the introduction member;

FIG. 16 is a schematic diagram illustrating a twelfth configurationexample of the introduction member;

FIG. 17 is a schematic diagram illustrating a thirteenth configurationexample of the introduction member;

FIG. 18 is a schematic cross-sectional view of a second configurationexample of the rotary electrical machine;

FIG. 19 is a side view of a second configuration example of a rotorillustrated in FIG. 18 as seen from a direction XIX of FIG. 18;

FIG. 20 is a side view of the second configuration example of the rotorillustrated in FIG. 18 as seen from a direction XX of FIG. 18;

FIG. 21 is a schematic cross-sectional view of a third configurationexample of the rotary electrical machine;

FIG. 22 is a schematic cross-sectional view of a fourth configurationexample of the rotary electrical machine;

FIG. 23 is a cross-sectional view of a third configuration example ofthe rotor;

FIG. 24 is a side view of the third configuration example of the rotor;

FIG. 25 is a schematic view of a configuration example of anintroduction member in which each pole is formed by one magnet; and

FIG. 26 is a side view of a fourth configuration example of the rotor.

DESCRIPTION OF EMBODIMENTS

Embodiments for carrying out the technique of the present disclosurewill be described below with reference to the drawings. Unless otherwisespecified, the term “to connect” means electrical connection. Each ofthe drawings illustrates elements necessary for describing the techniqueof the present disclosure. Therefore, each of the drawings may notillustrate all the actual elements. The upward, downward, rightward, andleftward directions are expressed below based on the illustrations inthe drawings. The magnets are hatched in the drawings fordifferentiation from other elements. Consecutive alphanumeric figuresare abbreviated with the word “to”. The form for fixing two elements maybe arbitrarily applied. Examples of the form for fixing includefastening with members such as bolts, screws, and pins, joining bywelding a molten base material, adhesion with an adhesive, etc.

First Embodiment

First embodiment will be described with reference to FIGS. 1 to 17. FIG.1 illustrates an inner rotor-type rotary electrical machine 10. Therotary electrical machine 10 in the present embodiment has a stator 11,a rotor 13, bearings 14, a shaft 15, introduction members 16, a sideplate 17, and the like in a frame 12.

The frame 12 corresponds to a “casing”, “housing”, and the like. Theshape and material of the frame 12 can be arbitrarily decided as far asit can accommodate the stator 11, the rotor 13, the bearings 14, theshaft 15, the introduction members 16, the side plate 17, etc. The frame12 supports and fixes at least the stator 11. The frame 12 furthersupports rotatably the shaft 15 via the bearings 14. The frame 12 in thepresent embodiment includes non-magnetic frame members 12 a and 12 b,etc. The frame members 12 a and 12 b may be integrally molded.Alternatively, the frame members 12 a and 12 b may be individuallyformed and then fixed to each other.

The stator 11 corresponds to an “armature”, and the like. The stator 11includes a multi-phase winding 11 a, a stator core 11 b, etc. The statorcore 11 b can be arbitrarily configured as far as it is a solid softmagnetic body. The stator core 11 b in the present embodiment is formedby laminating a large number of electromagnetic steel sheets, forexample.

The multi-phase winding 11 a is a winding of three or more phases storedand wound in a slot. The multi-phase winding 11 a corresponds to anarmature winding, a stator winding, a stator coil, and the like. Theform of the multi-phase winding 11 a can be arbitrarily decided.Therefore, the cross-sectional shape of the multi-phase winding 11 a isnot limited to a flat square but may be a circle or a triangle. Thewinding form of the multi-phase winding 11 a can be arbitrarily decided.Examples of the winding form of the multi-phase winding 11 a includefull-pitch winding, distributed winding, concentrated winding,fractional pitch winding, and the like. The slot is a storage space inthe stator core 11 b.

As illustrated in FIGS. 1 and 2, the rotor 13 in the present embodimenthas magnets 13 a, through holes 13 b, a rotor core 13 c, storage holes13 d, introduction members 16, a side plate 17, etc. The rotor 13 isopposed to the stator core 11 b. The rotor 13 is fixed to the shaft 15.The rotor 13 and the shaft 15 rotate integrally. There is an air gap Gbetween the rotor 13 and the stator 11. The width of the air gap G (thedistance between the rotor 13 and the stator 11) can be arbitrarilydecided in a range where magnetic flux flows between the rotor 13 andthe stator 11 (an arbitrary value can be set within the range ofnumerical values of distance satisfying this condition).

The rotor core 13 c can be arbitrarily configured as far as it is asolid soft magnetic body. The rotor core 13 c in the present embodimentis formed by laminating a large number of electromagnetic steel sheets,for example. The through holes 13 b and the storage holes 13 d arealigned in the rotor core 13 c in parallel with the axial direction. Thethrough holes 13 b and the storage holes 13 d in the present embodimentcommunicate with each other.

The one or more magnets 13 a are bar-like magnets that extend axiallyand are stored in the storage holes 13 d. As illustrated in FIGS. 1 and2, the magnets 13 a in the present embodiment are arranged closer to theouter radial side than to the through holes 13 b. An arbitrary number ofmagnets 13 a can be provided according to the number of necessary poles.There are no limitations on the kind of the magnets 13 a. As illustratedin FIG. 2, in the present embodiment, two each magnets 13 a are providedfor each pole. Examples of the kind of the magnets 13 a includeneodymium magnets and others.

The one or more through holes 13 b are bar-like holes that extendaxially to allow a refrigerant to flow and cool the magnets 13 a. Thethrough holes 13 b in the present embodiment have a barrier function toprevent magnetic leakage of the magnets 13 a. As illustrated in FIG. 2,the through holes 13 b in the present embodiment are positioned closerto the inner radial side than to the storage holes 13 d. Two each of thethrough holes 13 b adjacent in the circumferential direction of therotor 13 are deemed as one set, and eight sets are provided in thecircumferential direction.

The introduction members 16 introduce a refrigerant to cool the magnets13 a. As illustrated in FIGS. 1 and 3, in the present embodiment, theintroduction members 16 are provided on one end surface of the rotor 13but are not provided on the other end surface of the rotor 13 as seen inthe axial direction. An arbitrary number of the introduction members 16may be provided according to the number of the magnets 13 a, the numberof the through holes 13 b, etc. As illustrated in FIG. 3, in the presentembodiment, eight introduction members 16 are provided according to thenumber of poles of the magnets 13 a. A specific configuration example ofthe introduction members 16 will be described later.

The side plate 17 is a member that is also called “end plate” and fixesthe rotor core 13 c with the magnets 13 a stored in the storage holes 13d to the shaft 15. As illustrated in FIGS. 3 and 4, in the presentembodiment, the side plate 17 has through holes 17 b that communicatewith the through holes 13 b, and the like. The side plate 17 may includethrough holes (not illustrated) that communicate with the storage holes13 d. A rotational direction D1 of the rotor 13 illustrated in FIG. 3and a rotational direction D2 of the rotor 13 illustrated in FIG. 4 arethe same.

The introduction members 16 and the side plate 17 are formed from anon-magnetic body to suppress performance degradation due to fluxleakage. There are no limitations on the substances and constitution ofthe non-magnetic body under the condition that magnetic flux is unlikelyto flow in the non-magnetic body. Examples of the non-magnetic bodyinclude non-magnetic metals such as copper, aluminum, and stainlesssteel, and non-metallic materials such as resin. The introductionmembers 16 and the side plate 17 in the present embodiment are formedfrom a non-magnetic metal or a non-metallic material. The material forthe introduction members 16 and the side plate 17 is desirably higher inthermal conductivity than the rotor core 13 c to enhance heatdissipation. The introduction members 16 and the side plate 17 in thepresent embodiment are integrally molded.

A configuration example of the introduction members 16 will be describedwith reference to FIGS. 5 to 17. As illustrated in FIGS. 5 to 17, eachof the introduction members 16 includes an intake portion 16 a, aprotrusion portion 16 b, and a communication portion 16 c. The shape ofthe introduction member 16 can be arbitrarily decided as far as it canguide a refrigerant 18 a from the intake portion 16 a through theprotrusion portion 16 b to the communication portion 16 c. Theintroduction member 16 may have a shape with a continuous cross sectionsuch as scoop, pipe, tunnel, arcade, and arch, for example. The sameelements illustrated in FIGS. 5 to 17 are given identical referencesigns.

The intake portion 16 a is provided at one end of the protrusion portion16 b and is opened toward the rotational direction D1 of the rotor 13 totake in a refrigerant. The refrigerant 18 a is a fluid. The refrigerantmay be air, oil, oil mist, or the like, for example. The intake portion16 a is provided along the radial direction of the rotor 13 unlessotherwise specified. In the present embodiment, the air is used as therefrigerant 18 a. The protrusion portion 16 b protrudes axially from theend surface of the rotor 13. The communication portion 16 c is providedat the other end of the protrusion portion 16 b. The communicationportion 16 c communicates partly or entirely with an opening 13 b 1 ofthe through hole 13 b illustrated in FIGS. 15 to 17. When thecommunication portion 16 c and the opening 13 b 1 partly communicatewith each other, the portion of the opening 13 b 1 not communicatingwith the communication portion 16 c is blocked by the side plate 17.

First, a configuration example of the protrusion portion 16 b of theintroduction member 16, including its planar shape, arrangement, andnumber, will be described with reference to FIGS. 5 to 10.

As illustrated in FIG. 5, in the introduction member 16 of a firstconfiguration example in the present embodiment, the intake portion 16a, the protrusion portion 16 b, and the communication portion 16 c areprovided along the circumferential direction of the rotor 13. Therefrigerant 18 a taken in by the intake portion 16 a is sent directly toboth the through holes 13 b adjacent to each other in thecircumferential direction of the rotor 13 through the protrusion portion16 b and the communication portion 16 c. The introduction member 16 maybe configured as indicated with two-dot chain lines, including a ninthconfiguration example described later (see FIG. 13).

As illustrated in FIG. 6, the introduction member 16 of a secondconfiguration example in the present embodiment has the intake portion16 a and the communication portion 16 c shifted in the radial directionof the rotor 13. Specifically, the introduction member 16 has the intakeportion 16 a further radially outward than the communication portion 16c. The protrusion portion 16 b connecting the intake portion 16 a andthe communication portion 16 c may have a linear shape as indicated withsolid lines. Alternatively, the protrusion portion 16 b may have an arcshape or a curve shape as indicated with two-dot chain lines. As in thepresent configuration example, the intake portion 16 a provided on theouter radial side has a larger amount of rotational movement than thatof the introduction member 16 in the first configuration example.Accordingly, in the present configuration example, a larger amount ofrefrigerant is taken in.

As illustrated in FIG. 7, the introduction member 16 of a thirdconfiguration example in the present embodiment is shaped such that asurface-direction width 16 w of the protrusion portion 16 b along theend surface of the rotor 13 is gradually smaller from the intake portion16 a toward the communication portion 16 c. That is, the introductionmember 16 has the wide intake portion 16 a to take in the refrigerant 18a. Accordingly, in the present configuration example, the refrigerant 18a is increased in pressure and is larger in flow rate while moving inthe protrusion portion 16 b.

As illustrated in FIG. 8, in the introduction member 16 of a fourthconfiguration example in the present embodiment, an outer radial-sideportion of the intake portion 16 a protrudes toward the rotationaldirection D1 of the rotor 13 more than an inner radial-side portion ofthe intake portion 16 a. That is, the introduction member 16 is largerin circumference and increased in the amount of rotational movement withincreasing proximity to the outer radial side. Accordingly, in thepresent configuration example, the intake amount of the refrigerant 18 acan be increased.

As illustrated in FIG. 9, the number of the introduction members 16 of afifth configuration example in the present embodiment corresponds to thenumber of the through holes 13 b. As illustrated in FIG. 2, in thepresent embodiment, two each through holes 13 b are provided for eachpole of the magnet 13 a. Accordingly, as illustrated in FIG. 9, two eachintroduction members 16 in the present configuration example areprovided in the same manner. The two introduction members 16 arearranged on the outer radial side and the inner radial side such thatthey communicate with the corresponding through holes 13 b. Referring toFIG. 9, the introduction member 16 illustrated on the upper sidecorresponds to the introduction member 16 on the outer radial side andthe introduction member 16 illustrated on the lower side corresponds tothe introduction member 16 on the inner radial side. To cool equally thetwo magnets 13 a by equalizing the flow rates of the refrigerant 18 ainto the two through holes 13 b, the two introduction members 16desirably have the intake portions 16 a equal in opening areas.

As illustrated in FIG. 10, the introduction member 16 of a sixthconfiguration example in the present embodiment is a modification of thefifth configuration example. The fifth configuration example has the twointroduction members 16. In contrast to this, the present configurationexample has one introduction member 16 with a division wall 16 d. Thedivision wall 16 d is provided from the intake portion 16 a to thecommunication portion 16 c. An outer radial-side first intake portion 16a 1 divided by the division wall 16 d corresponds to the outerradial-side intake portion 16 a illustrated in FIG. 9. An innerradial-side second intake portion 16 a 2 corresponds to the innerradial-side intake portion 16 a illustrated in FIG. 9. As in the casewith the fifth configuration example, to cool equally the two magnets 13a, the first intake portion 16 a 1 and the second intake portion 16 a 2are desirably equal in opening area.

Next, a configuration example of the front shape of the intake portion16 a of the introduction member 16 will be described with reference toFIGS. 11 to 14.

As illustrated in FIG. 11, the introduction member 16 of a seventhconfiguration example in the present embodiment has an intake portion 16a with a semi-circular front surface. Specifically, the introductionmember 16 has the semi-circular intake portion 16 a including an outerradial-side wall portion 16 ae and an inner radial-side wall portion 16ai. The outer radial-side wall portion 16 ae has an inclination angle(first inclination angle) α relative to the radial direction, and theinner radial-side wall portion 16 ai has an inclination angle (secondinclination angle) β relative to the radial direction. In this case, thefirst and second inclination angles α and β are in a relationship α=β.That is, the introduction member 16 has the equal inclination angles αand β with respect to the outer radial-side wall and the innerradial-side wall. Accordingly, in the present configuration example, therefrigerant 18 a is equally taken in on the outer radial side and theinner radial side of the introduction member 16.

As illustrated in FIG. 12, the introduction member 16 of an eighthconfiguration example in the present embodiment has the intake portion16 a including an outer radial-side wall portion 16 ae and an innerradial-side wall portion 16 ai. The outer radial-side wall portion 16 aehas an inclination angle (first inclination angle) α relative to theradial direction, and the inner radial-side wall portion 16 ai has aninclination angle (second inclination angle) β relative to the radialdirection. In this case, the first and second inclination angles α and βare in a relationship α>β. That is, in the introduction member 16, theinclination angle α of the outer radial-side wall portion 16 ae islarger than the inclination angle β of the inner radial-side wallportion 16 ai. Accordingly, the introduction member 16 becomes larger incircumference and increases in the amount of rotational movement withincreasing proximity to the outer radial side. Therefore, in the presentconfiguration example, the intake amount of the refrigerant 18 a can beincreased.

As illustrated in FIG. 13, the introduction member 16 of a ninthconfiguration example in the present embodiment has the intake portion16 a of an inverse J shape from the outer radial-side end to the peakportion. As illustrated with the two-dot chain lines in FIGS. 13 and 5,the introduction member 16 is configured such that the axial protrusionis gradually closed from the intake portion 16 a to the middle of theprotrusion portion 16 b. Accordingly, in the present configurationexample, the refrigerant 18 a is guided toward the communication portion16 c.

As illustrated in FIG. 14, the introduction member 16 of a tenthconfiguration example in the present embodiment has the intake portion16 a with a square front surface together with the side plate 17. In thepresent configuration example, as in the case with the seventhconfiguration example illustrated in FIG. 11, the inclination angles αand β of the outer radial-side and inner radial-side walls are equal.Accordingly, in the present configuration example, the refrigerant 18 ais equally taken in on the outer radial side and inner radial side ofthe introduction member 16. The introduction member 16 of the presentconfiguration example may be configured such that the inclination angleα of the outer radial-side wall portion 16 ae and the inclination angleβ of the inner radial-side wall portion 16 ai are in the relationship ofα>β (not illustrated) as in the eighth configuration example illustratedin FIG. 12. In addition, the introduction member 16 of the presentconfiguration example may be configured to have an inverse L shape fromthe outer radial-side end to the peak portion as in the ninthconfiguration example illustrated in FIG. 13. Further, as illustratedwith two-dot chain lines in FIG. 14, the introduction member 16 in thepresent configuration example may be configured such that the intakeportion 16 a is partly curved (at the corners of the square shape).

Further, a configuration example of a cross-sectional shape of theprotrusion portion 16 b of the introduction member 16 will be describedwith reference to FIGS. 15 to 17. Each of FIGS. 15 to 17 illustrates theflow of the refrigerant 18 a with arrow D3 (hereinafter, called“introduction direction D3”). As indicated by the introduction directionD3 in each of the drawings, the refrigerant 18 a is taken into theintroduction member 16 via the intake portion 16 a. After that, therefrigerant 18 a flows along the protrusion portion 16 b of theintroduction member 16, and then flows into the through hole 13 b of therotor 13 through the communication portion 16 c and the through hole 17b. An internal height 16 h illustrated in FIGS. 15 to 17 refers to theheight of the space in which the refrigerant 18 a flows in theintroduction member 16.

As illustrated in FIG. 15, the introduction member 16 of an eleventhconfiguration example in the present embodiment includes the protrusionportion 16 b having a first protrusion portion 16 b 1 and a secondprotrusion portion 16 b 2. The first protrusion portion 16 b 1 is aportion in which the internal height 16 h from the intake portion 16 ato the side plate 17 does not change. The second protrusion portion 16 b2 is a region that is arc-shaped in cross section and includes thecommunication portion 16 c on the rear side (the right side of FIG. 15)with respect to the rotational direction D1 of the rotor 13.Accordingly, the internal height 16 h is low in the second protrusionportion 16 b 2.

As illustrated in FIG. 16, the introduction member 16 of a twelfthconfiguration example in the present embodiment has the protrusionportion 16 b in which the internal height 16 h becomes gradually lowerfrom the intake portion 16 a to the communication portion 16 c.Accordingly, in the present configuration example, the refrigerant 18 ais enhanced in pressure and is increased in flow rate while moving inthe introduction member 16.

The magnet 13 a is equally cooled in the two through holes 13 b.Accordingly, the refrigerant 18 a is desirably branched such that theflow rates into the openings 13 b 1 become equal. The presentconfiguration example is configured such that a volume Vf of a firstspace hatched in FIG. 16 and a volume Vr of a second space hatched inFIG. 6 are in a relationship Vf>Vr. The volume Vf of the first space isthe volume of a space from the front-side opening 13 b 1 with respect tothe rotational direction D1 of the rotor 13 to the inner wall surface ofthe protrusion portion 16 b (the left part hatched in FIG. 16). Thevolume Vr of the second space is the volume of a space from therear-side opening 13 b 1 with respect to the rotational direction D1 ofthe rotor 13 to the inner wall surface of the protrusion portion 16 b(the right part hatched in FIG. 16).

As illustrated in FIG. 17, the introduction member 16 of a thirteenthconfiguration example in the present embodiment is a modification of theeleventh configuration example. The present configuration example isdifferent from the eleventh configuration example in including thecommunication portion 16 c that equalizes the flow rates of therefrigerant 18 a into the two through holes 13 b. In the twelfthconfiguration example, the volume Vf of the first space and the volumeVr of the second space are in the relationship Vf>Vr. In contrast tothis, the communication portion 16 c of the present configurationexample has a first communication portion 16 c 1 and a secondcommunication portion 16 c 2 different in opening area. The firstcommunication portion 16 c 1 has an opening area (first area) Sf, andthe second communication portion 16 c 2 has an opening area (secondarea) Sr. In this case, the opening areas of the communication portionsare preferably configured such that the first area Sf and the secondarea Sr are in the relationship Sf>Sr.

The introduction member 16 in the present embodiment can be formed bycombining the configurations of the examples described above.Specifically, the first to sixth configuration examples relating to theplanar shape of the protrusion portion 16 b, the seventh to tenthconfiguration examples relating to the planar shape of the intakeportion 16 a, and the eleventh to thirteenth configuration examplesrelating to the cross-sectional shape of the protrusion portion 16 b canbe combined in any way. Accordingly, there are a total of 72 (=6×4×3)combinations of the introduction member 16 in the present embodiment.For example, for the introduction member 16, there are combinations of{the first configuration example, the seventh configuration example, andthe eleventh configuration example}, combinations of {the secondconfiguration example, the eighth configuration example, and the twelfthconfiguration example}, combinations of {the third configurationexample, the ninth configuration example, and the thirteenthconfiguration example}, combinations of {the sixth configurationexample, the tenth configuration example, and the thirteenthconfiguration example}, etc. For the introduction member 16 in thepresent embodiment, the configurations of the examples can be combineddepending on the specifications and rating of the rotary electricalmachine 10, the forms of the magnets 13 a and the through holes 13 b(for example, shape, size, and number), and others, for example.

The foregoing rotary electrical machine 10 in the present embodimentproduces the advantageous effects described below.

(1) The rotary electrical machine 10 illustrated in FIG. 1 has the rotor13, the stator 11, etc. The rotor 13 has the magnets 13 a, the throughholes 13 b, the rotor core 13 c, the storage holes 13 d, theintroduction members 16, the side plate 17, etc. The introductionmembers 16 communicate partly or entirely with the openings 13 b 1 ofthe one or more through holes 13 b and introduce the refrigerant 18 a.Each of the introduction members 16 includes the intake portion 16 a,the protrusion portion 16 b, and the communication portion 16 c. Asillustrated in FIGS. 5 to 10, the intake portion 16 a is provided at theone end of the protrusion portion 16 b and is opened toward therotational direction D1 of the rotor 13 to take in the refrigerant 18 a.The protrusion portion 16 b protrudes axially from the end surface ofthe rotor 13. As illustrated in FIGS. 15 to 17, the communicationportion 16 c is provided at the other end of the protrusion portion 16b. The communication portion 16 c communicates with the two openings 13b 1 adjacent to each other in the circumferential direction. In thisway, in the rotary electrical machine 10, the introduction members 16protrude axially from the end surface of the rotor 13 and are openedtoward the rotational direction D1 of the rotor 13. Accordingly, in therotary electrical machine 10, the refrigerant 18 a can be activelyintroduced without influence of the air-curtain effect. As a result, inthe rotary electrical machine 10, it is possible to cool efficiently themagnets 13 a that might suffer performance degradation due totemperature rise. Accordingly, in the rotary electrical machine 10, itis possible to suppress decrease in the characteristics and performanceof the magnets 13 a. In addition, in the rotary electrical machine 10,it is possible to reduce the amount of dysprosium used to avoid thermaldemagnetization of the magnets 13 a (the usage of rare earth element).Accordingly, in the rotary electrical machine 10, it is possible tosuppress the manufacturing cost of the rotor 13. In the rotaryelectrical machine 10, each of the two openings 13 b 1 communicates withthe corresponding storage hole 13 d in which the magnet 13 a is stored.Accordingly, in the rotary electrical machine 10, both magnets 13 a canbe efficiently cooled.

(2) As illustrated in FIGS. 1 and 2, in the rotary electrical machine10, the magnets 13 a are arranged closer to the outer radial side thanto the through holes 13 b. Accordingly, the refrigerant 18 a passingthrough the through holes 13 b moves in such a manner as to be attractedto the outer radial side on which the magnets 13 a are arranged undercentrifugal action. Accordingly, in the rotary electrical machine 10,the magnets 13 a can be efficiently cooled.

(3) As illustrated in FIGS. 2 to 10, in the rotary electrical machine10, the through holes 13 b communicate with the storage holes 13 dstoring the magnets 13 a and have the barrier function to preventmagnetic leakage of the magnets 13 a. Accordingly, the through holes 13b act as magnetic leakage preventive barriers to prevent magneticleakage of the magnets 13 a. Accordingly, in the rotary electricalmachine 10, the refrigerant 18 a can cool not only the wall surfaces ofthe through holes 13 b but also the side surfaces of the magnets 13 a.

(4) As illustrated in FIGS. 5 to 17, in the rotary electrical machine10, the introduction members 16 are scoop-shaped. Accordingly, in therotary electrical machine 10, the refrigerant 18 a subjected torotational force can be passed into the through holes 13 b withoutwaste. As a result, in the rotary electrical machine 10, the magnets 13a can be efficiently cooled.

(5) As illustrated in FIG. 6, in the rotary electrical machine 10, theintake portion 16 a is positioned closer to the outer radial side thanto the communication portion 16 c. Accordingly, in the rotary electricalmachine 10, the amount of rotational movement becomes larger withincreasing proximity to the outer radial side to take in a larger amountof refrigerant 18 a (increase the amount of refrigerant). As a result,in the rotary electrical machine 10, the cooling efficiency is improved.

(6) As illustrated in FIG. 12, in the rotary electrical machine 10, theintake portion 16 a includes the outer radial-side wall portion 16 aeand the inner radial-side wall portion 16 ai that extend axially fromthe end surface of the rotor 13. The outer radial-side wall portion 16ae has the inclination angle (first inclination angle) α relative to theradial direction and the inner radial-side wall portion 16 ai has theinclination angle (second inclination angle) β relative to the radialdirection. In this case, in the rotary electrical machine 10, the firstand second inclination angles α and β are in the relationship α>β.Accordingly, in the rotary electrical machine 10, the inclination angleα of the outer radial-side wall portion 16 ae is larger than theinclination angle β of the inner radial-side wall portion 16 ai to takein a larger amount of the refrigerant 18 a (increase the amount of therefrigerant). As a result, in the rotary electrical machine 10, thecooling efficiency is improved.

(7) As illustrated in FIG. 16, in the rotary electrical machine 10, theintroduction member 16 has the internal height (16 h) of the protrusionportion 16 b that is gradually smaller from the intake portion 16 atoward the communication portion 16 c. Accordingly, in the rotaryelectrical machine 10, the refrigerant 18 a is gradually increased inpressure while moving in the introduction member 16. As a result, in therotary electrical machine 10, even when the axis of the rotor 13illustrated in FIG. 1 is long, the refrigerant 18 a is guided reliablyto the opposite side surface (the right side surface in FIG. 1) of thethrough hole 13 b.

(8) As illustrated in FIG. 7, in the rotary electrical machine 10, thesurface-direction width (16 w) of the protrusion portion 16 b isgradually smaller from the intake portion 16 a toward the communicationportion 16 c along the end surface of the rotor 13. Accordingly, in therotary electrical machine 10, the refrigerant 18 a is graduallyincreased in pressure while moving in the introduction member 16. As aresult, in the rotary electrical machine 10, even when the axis of therotor 13 illustrated in FIG. 1 is long, the refrigerant 18 a is guidedreliably to the opposite side surface (the right side surface in FIG. 1)of the through hole 13 b.

(10) As illustrated in FIGS. 15 to 17, in the introduction member 16 ofthe rotary electrical machine 10, the introduction member 16 is providedsuch that the communication portion 16 c communicates with the pluralityof openings 13 b 1. The refrigerant 18 a is branched such that an equalamount of refrigerant 18 a flows into the plurality of openings 13 b 1.Accordingly, in the rotary electrical machine 10, an equal amount ofrefrigerant 18 a flows into the through holes 13 b. Accordingly, in therotary electrical machine 10, the magnets 13 a corresponding to thethrough holes 13 b can be equally cooled.

(11) As illustrated in FIGS. 15 to 17, in the rotary electrical machine10, the plurality of openings 13 b 1 is provided on the front side andthe rear side with respect to the rotational direction D1 of the rotor13. As illustrated in FIG. 16, the first space from the front-sideopening 13 b 1 to the inner wall surface of the protrusion portion 16 bhas the volume Vf, and the second space from the rear-side opening 13 b1 to the inner wall surface of the protrusion portion 16 b has thevolume Vr. In this case, in the rotary electrical machine 10, the firstand second spaces Vf and Vr are in the relationship Vf>Vr. Accordingly,in the rotary electrical machine 10, while the refrigerant 18 a taken infrom the intake portion 16 a moves toward the through hole 13 b, therefrigerant 18 a is increased in pressure and flow rate with increasingproximity to the rear side in the rotational direction D1. As a result,in the rotary electrical machine 10, an equal amount of refrigerant 18 aflows into the through holes 13 b positioned on the front side and rearside with respect to the rotational direction D1 of the rotor 13.

(12) As illustrated in FIGS. 1 and 15 to 17, in the rotary electricalmachine 10, the introduction member 16 is molded integrally with theside plate 17 provided on the end surface of the rotor 13. Accordingly,in the rotary electrical machine 10, there is no need to prepare aseparate introduction member 16. Accordingly, in the rotary electricalmachine 10, it is possible to suppress the manufacturing cost of therotor 13. In addition, in the rotary electrical machine 10, theintroduction member 16 and the side plate 17 are provided as onecomponent. Accordingly, in the rotary electrical machine 10, there is noreduction in the work efficiency during manufacture of the rotor 13.

(13) As illustrated in FIG. 1, in the rotary electrical machine 10, thematerial for the introduction member 16 is a non-magnetic body or amaterial including a non-magnetic body. Accordingly, in the rotaryelectrical machine 10, it is possible to suppress performancedegradation due to flux leakage.

Second Embodiment

A second embodiment will be described with reference to FIGS. 18 to 20.For simplicity of illustration and description, unless otherwisespecified, the same components as those of the first embodiment will begiven the same reference signs and description thereof will be omitted.Accordingly, differences from the first embodiment will be mainlydescribed.

FIG. 18 illustrates an inner rotor-type rotary electrical machine 10.The rotary electrical machine 10 in the present embodiment has a stator11, a rotor 13, a bearing 14, a shaft 15, introduction members 16, aside plate 17, and others in a frame 12, as in the first embodiment. Inthe first embodiment, all the introduction members 16 are provided atone end surface of the rotor 13 as seen from the axial direction asillustrated in FIG. 1. The rotary electrical machine 10 in the presentembodiment is different from the rotary electrical machine 10 in thefirst embodiment in the position of the introduction members 16.

In the rotary electrical machine 10 in the present embodiment, asillustrated in FIG. 18, the introduction members 16 are provided on bothend surfaces of the rotor 13. Further, in the rotary electrical machine10, as illustrated in FIGS. 19 and 20, the introduction members 16 areprovided such that, on both end surfaces of the rotor 13, the throughhole 13 b communicating on one end surface and the through hole 13 bcommunicating on the other end surface are different. The introductionmembers 16 in the present embodiment are configured in the same manneras those in the first embodiment.

In the rotary electrical machine 10 in the present embodiment, the sameadvantageous effects as those in the first embodiment can be obtainedand the following advantageous effects can also be obtained.

(9) As illustrated in FIGS. 18 to 20, in the rotary electrical machine10, the introduction members 16 are provided on both end surfaces of therotor 13. Further, in the rotary electrical machine 10, the introductionmembers 16 are provided such that, on both end surfaces of the rotor 13,the through hole 13 b communicating with one end surface and the throughhole 13 b communicating with the other end surface are different.Accordingly, in the rotary electrical machine 10, the refrigerant 18 ais taken in from both end surfaces of the rotor 13 and is dischargedfrom the other end surface. As a result, in the rotary electricalmachine 10, cooling can be performed in a balanced manner.

Third Embodiment

A third embodiment will be described with reference to FIGS. 21 and 22.For simplicity of illustration and description, unless otherwisespecified, the same components as those of the first to secondembodiments will be given the same reference signs and descriptionthereof will be omitted. Accordingly, differences from the first andsecond embodiments will be mainly described.

FIGS. 21 and 22 illustrate an inner rotor-type rotary electrical machine10. The rotary electrical machine 10 in the present embodiment has astator 11, a rotor 13, a bearing 14, a shaft 15, introduction members16, a side plate 17, and others in a frame 12, as in the firstembodiment. In the first and second embodiments, the air is used as therefrigerant 18 a. The rotary electrical machine 10 in the presentembodiment is different from the rotary electrical machines 10 in thefirst and second embodiments in that oil is used as the refrigerant 18b. In the present embodiment, the capacity for the refrigerant 18 b isdesirably set such that the introduction members 16 on the lower sidesof FIGS. 21 and 22 are under the liquid level.

The rotary electrical machine 10 illustrated in FIG. 21 is similar tothe rotary electrical machine 10 illustrated in FIG. 1 (the rotaryelectrical machine 10 in the first embodiment) except for therefrigerant 18 b. Accordingly, in the rotary electrical machine 10 inthe present embodiment, the same advantageous effects as those of thefirst embodiment can be obtained. In addition, the rotary electricalmachine 10 illustrated in FIG. 22 is similar to the rotary electricalmachine 10 illustrated in FIG. 18 (the rotary electrical machine 10 inthe second embodiment) except for the refrigerant 18 b. Accordingly, inthe rotary electrical machine 10 in the present embodiment, the sameadvantageous effects as those of the second embodiment can be obtained.

Fourth Embodiment

A fourth embodiment will be described with reference to FIGS. 23 and 24.For simplicity of illustration and description, unless otherwisespecified, the same components as those of the first to thirdembodiments will be given the same reference signs and descriptionthereof will be omitted. Accordingly, differences from the first tothird embodiments will be mainly described.

The rotor 13 illustrated in FIG. 23 is a substitute for the rotors 13illustrated in FIGS. 1, 18, 21, and 22. The rotor 13 in the presentembodiment has a plurality of partial rotors 131 to 134. The partialrotors 131 to 134 are configured in the same manner as the rotors 13illustrated in FIGS. 1, 18, 21, and 22. The partial rotors 131 to 134are different from those in the first to third embodiments in that theaxial length is shorter. In the present embodiment, the rotor 13 has thefour partial rotors 131 to 134, but the technique of the presentdisclosure is not limited to this. The number of the partial rotorsincluded in the rotor 13 can be arbitrarily set to two or more.

The partial rotors 131 and 133 are configured as illustrated in FIG. 2,for example. The partial rotors 132 and 134 are configured asillustrated in FIG. 24, for example. With the partial rotors 131 and 133configured as illustrated in FIG. 2 at reference positions, the partialrotors 132 and 134 are positioned with a turn of an angle θ. In thepresent embodiment, the partial rotors 132 and 134 are shifted at theangle θ circumferentially. Accordingly, as illustrated in FIG. 23, thepositions of the magnets 13 a and the through holes 13 b are shiftedcircumferentially. In this manner, in the present embodiment, even whenthe through holes 13 b are shifted circumferentially, the refrigerant 18a or 18 b passes through the introduction members 16 and flow from oneaxial end surface to the other axial surface illustrated in FIG. 23.Accordingly, in the present embodiment, the same advantageous effects asthose of the first to third embodiment can be obtained.

In the rotor 13 in the present embodiment, the plurality of partialrotors 131 to 134 can be shifted in any way as far as the refrigerant 18a or 18 b can flow from the one axial end surface to the other axial endsurface. For example, in the rotor 13, the partial rotors 131 and 134may be arranged at reference positions and the partial rotors 132 and133 may be arranged at positions with a turn of the angle θ.Alternatively, in the rotor 13, the partial rotor 131 may be arranged ata reference position, the partial rotor 132 may be arranged at aposition with a turn of an angle 2θ, the partial rotor 133 may bearranged at a position turned with a turn of an angle 3θ, and thepartial rotor 134 may be arranged at a position with a turn of an angle4θ. Still alternatively, in the rotor 13, the angle θ at which thepartial rotors 131 to 134 are shifted may not be constant but may bechanged. In the rotary electrical machine 10 in the present embodiment,even when each of the partial rotors 131 to 134 is arranged in any way,the same advantageous effects as those of the first to third embodimentscan be obtained as far as the foregoing condition (that the refrigerant18 a or 18 b can flow) is satisfied.

Other Embodiments

The first to fourth embodiments as modes for carrying out the techniqueof the present disclosure have been described so far, but the techniqueof the present disclosure is not limited to them. The technique of thepresent disclosure can be carried out in various manners. For example,the following modes may be implemented.

In the first to fourth embodiments described above, as illustrated inFIGS. 2 and 24, the number of poles of the rotor 13 is set to eight andtwo each magnets 13 a are provided for each pole. Instead of this mode,in a modification example, the number of poles of the rotor 13 may beset to any value other than eight. In addition, as illustrated in FIG.25, one each magnet 13 a may be provided for each pole. In the rotor 13illustrated in FIG. 25, the magnet 13 a is stored in the storage hole 13d. The through hole 13 b is provided from both sides of the storage hole13 d in the circumferential direction of the rotor 13. The introductionmember 16 indicated by two-dot chain lines is provided to introduce therefrigerant 18 a or 18 b into the two through holes 13 b. Three or moremagnets 13 a may be provided for each pole (not illustrated). One magnet13 a may be formed from a plurality of partial magnets. In this way, thepresent modification example and the first to fourth embodiments aredifferent only in the number of the magnets 13 a provided for each pole.Accordingly, in the present modification example, the same advantageouseffects as those of the first to fourth embodiments can be obtained.

In the first to fourth embodiments, the through holes 13 b and thestorage holes 13 d are formed in the shapes as illustrated in FIGS. 2 to4, 19, 20, and 24. Instead of this mode, in a modification example, thethrough holes 13 b and the storage holes 13 d may be formed in theshapes as illustrated in FIG. 26. That is, the through holes 13 b can beimplemented in any shape on the condition that the refrigerant 18 a or18 b can flow. The storage holes 13 d can be implemented in any shape onthe condition that the magnets 13 a can be stored. In this way, thepresent modification example and the first to fourth embodiments aredifferent only in the shapes of the through holes 13 b and the storageholes 13 d. Accordingly, in the present modification example, the sameadvantageous effects as those of the first to fourth embodiments can beobtained.

In the first to fourth embodiments, as illustrated in FIGS. 1, 18, 21,and 22, the introduction members 16 and the side plate 17 are integrallymolded. Instead of this mode, in a modification example, the separatelymolded introduction members 16 and side plate 17 may be fixed together.In this configuration, as illustrated in FIGS. 15 and 16, thecommunication portion 16 c and the through hole 17 b are desirablyformed in the same shape. In addition, referring to FIG. 17, the openingarea of a second communication portion 16 c 2 is made smaller than theopening area of a first communication portion 16 c 1. Instead of thismode, in a modification example, the opening area of the through hole 17b corresponding to the second communication portion 16 c 2 may be madesmaller than the opening area of the through hole 17 b corresponding tothe first communication portion 16 c 1. In this way, the presentmodification example and the first to fourth embodiments are differentonly in whether the introduction members 16 and the side plate 17 areformed integrally or separately. Accordingly, in the presentmodification example, the same advantageous effects as those of thefirst to fourth embodiments can be obtained.

In the first to fourth embodiments, the technique in the presentdisclosure is applied to the inner rotor-type rotary electrical machines10. Instead of this mode, in a modification example, the technique inthe present disclosure may be applied to outer rotor-type rotaryelectrical machines. In this way, the present modification example andthe first to fourth embodiments are different only in the arrangement ofthe stator 11 and the rotor 13. Accordingly, in the present modificationexample, the same advantageous effects as those of the first to fourthembodiments can be obtained.

REFERENCE SIGNS LIST

1 . . . Rotary electrical machine

11 . . . Stator

13 . . . Rotor

13 a . . . Magnet

13 b . . . Through hole

13 c . . . Rotor core

13 d . . . Storage hole

16 . . . Introduction member

16 a . . . Intake portion

16 b . . . Protrusion portion

16 c . . . Communication portion

17 . . . Side plate

18 a, 18 b . . . Refrigerant

1. A rotary electrical machine comprising: a rotor that includes one ormore magnets and one or more through holes penetrating in an axialdirection; and a stator that is opposed to the rotor, wherein the rotaryelectrical machine has an introduction member that communicatespartially or entirely with the one or more penetration holes andintroduces a refrigerant, and the introduction member includes aprotrusion portion that protrudes axially from an end surface of therotor, an intake portion that is provided at one end of the protrusionportion and is opened toward a rotational direction of the rotor to takein the refrigerant, and a communication portion that is provided at theother end of the protrusion portion and communicates with the opening.2. The rotary electrical machine according to claim 1, wherein themagnet is arranged closer to an outer radial side than to the throughhole.
 3. The rotary electrical machine according to claim 2, wherein thethrough hole communicates with a storage hole storing the magnet and hasa barrier function to prevent magnetic leakage of the magnet.
 4. Therotary electrical machine according to claim 1, wherein the introductionmember is scoop-shaped.
 5. The rotary electrical machine according claim1, wherein the intake portion is positioned closer to the outer radialside than to the communication portion.
 6. The rotary electrical machineaccording to claim 5, wherein the intake portion includes an outerradial-side wall portion and an inner radial-side wall portion thatextend axially from the end surface of the rotor, and the outerradial-side wall portion has an inclination angle α and the innerradial-side wall portion has an inclination angle β, and the inclinationangles α and β are in a relationship α>β.
 7. The rotary electricalmachine according to claim 1, wherein the introduction member has aninternal height of the protrusion portion that is gradually smaller fromthe intake portion toward the communication portion.
 8. The rotaryelectrical machine according to claim 1, wherein the introduction memberhas a surface-direction width of the protrusion portion that isgradually smaller from the intake portion toward the communicationportion along the end surface of the rotor.
 9. The rotary electricalmachine according to claim 1, wherein the introduction members areprovided on both end surfaces of the rotor, and the introduction membersare provided such that the through hole communicating with one endsurface and the through hole communicating with the other end surfaceare different.
 10. The rotary electrical machine according to claim 1,wherein the introduction member is provided such that the communicationportion communicates with a plurality of the openings, and therefrigerant is branched so that an equal amount of refrigerant flowsinto the plurality of openings.
 11. The rotary electrical machineaccording to claim 10, wherein the plurality of openings is provided ona front side and a rear side with respect to the rotational direction ofthe rotor, and a first space from the opening on a front side to theinner wall surface of the protrusion portion has a volume Vf and asecond space from the opening on a rear side to the inner wall surfaceof the protrusion portion has a volume Vr, and the volumes Vf and Vr arein a relationship Vf>Vr.
 12. The rotary electrical machine according toclaim 1, wherein the introduction member is molded integrally with aside plate provided on the end surface of the rotor.
 13. The rotaryelectrical machine according to claim 1, wherein a material for theintroduction member is a non-magnetic body or a material including anon-magnetic body.